Aku didn’t like the way Azura was looking and sounding. Her graying skin and sharp teeth had him especially concerned. However, speaking up about it would most certainly give away his position. There had to be another way to communicate without being overheard by Black Hat.
Casper, with her ability to see and speak to creatures of darkness, was his best bet for being heard. So Aku began to concentrate on making his unspoken thoughts as loud as possible and focused on “pushing” them into the head upon which he sat, which happened to be Casper’s.
‘Casper,’ he thought as loudly as he could. ‘She is doing poorly. Respond if you can hear me.’
The Shogun of Sorrow 